Critical Weak Authentication Vulnerability in Yadea T5 Electric Bicycle Enables Theft Risk
Vulnerability coverage focused on affected versions, exploitability and patch or mitigation decisions.
By: Artur Ślesik
Published: Apr 23, 2026
Updated: May 01, 2026
Incident status: Active threat
Corroborating sources: 1
Technical review credentials: Security+ evidence | RHCSA evidence | JNCIS-SEC evidence
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Technical reviewer note: Marcin Pocztowski reviewed this alert on May 01, 2026 from an administrator's point of view, checking CVE-2025-70994 against vendor, CVE and advisory context before accepting the risk language. His remediation check is practical: confirm the affected version first, restrict reachable management surfaces as he would on Juniper, Cisco or Mikrotik routers, then patch or apply vendor mitigations only where the 1 corroborating source supports that scope.
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Active threat. The incident should still be treated as active until confirmed mitigation or patch adoption is verified.
A high-severity vulnerability (CVE-2025-70994) affecting all versions of the Yadea T5 Electric Bicycle has been publicly disclosed by CISA in April 2026. The flaw allows attackers to forge signals after intercepting legitimate key fob transmissions, enabling unauthorized unlocking and starting of the bicycle, leading to potential vehicle theft.
What happened
In April 2026, the Cybersecurity and Infrastructure Security Agency (CISA) issued an advisory detailing a critical security vulnerability identified as CVE-2025-70994 in the Yadea T5 Electric Bicycle. This vulnerability stems from a weak authentication mechanism in the bicycle's keyless entry system, which allows an attacker with local proximity to intercept legitimate key fob signals and subsequently forge them. Successful exploitation grants the attacker the ability to unlock and start the bicycle without authorization, effectively enabling theft.
The advisory highlights that this weakness is inherent across all versions of the Yadea T5 Electric Bicycle, a product widely deployed globally within transportation systems. Despite CISA's outreach, Yadea has not responded to coordination attempts, leaving users reliant on external mitigations and best practices.
Confirmed facts
- Vulnerability Identifier: CVE-2025-70994
- Product Affected: Yadea T5 Electric Bicycle (all versions)
- Vulnerability Type: Weak authentication enabling signal forgery
- Attack Vector: Local attacker intercepts key fob transmissions to forge signals
- Impact: Unauthorized unlocking and starting of the bicycle, leading to theft
- CVSS v3.1 Score: 7.3 (High)
- Exploitability: Requires local proximity; not remotely exploitable
- Vendor Response: No response from Yadea to CISA's coordination attempts
- Mitigation: Keep systems updated if possible; use external locking mechanisms
- Reported by: Ashen Chathuranga to MITRE and CISA
- Public Exploitation: No known public exploitation reported as of April 2026
Who is affected
Owners and users of the Yadea T5 Electric Bicycle worldwide are at risk. Given the bicycle's global deployment in transportation infrastructure, this vulnerability poses a significant threat to individual consumers, fleet operators, and potentially public bike-sharing programs utilizing this model.
The risk is especially acute for users who rely solely on the built-in keyless authentication system without additional physical security measures. Since the attack requires local interception of key fob signals, bicycles parked in accessible public or semi-public areas are particularly vulnerable.
What to do now
- Physically Secure Your Bicycle: Use high-quality external locks such as U-locks or chains to secure the bicycle frame and wheels to immovable objects.
- Limit Exposure: Avoid leaving the bicycle unattended in unsecured or high-traffic areas where attackers could intercept key fob signals.
- Contact Yadea: Reach out to the manufacturer via their official contact page (https://yadea.com/contact-us) to inquire about firmware updates or patches addressing this vulnerability.
- Stay Informed: Monitor CISA advisories and cybersecurity news sources for updates or new mitigation strategies.
- Report Suspicious Activity: If you suspect attempted theft or unauthorized access, report incidents to local law enforcement and CISA for tracking.
How to secure yourself
- Use External Security Devices: Supplement the bicycle's keyless system with physical security devices such as locks, alarms, or GPS trackers.
- Signal Shielding: When not using the key fob, store it in a Faraday pouch or signal-blocking container to prevent interception.
- Firmware Updates: Regularly check for and apply any firmware updates or patches released by Yadea, though none have been confirmed as available yet.
- Awareness and Vigilance: Be cautious in environments where attackers might be able to intercept signals, such as crowded bike racks or public parking.
- Insurance: Consider insurance policies that cover theft of electric bicycles to mitigate financial loss.
FAQ
What is CVE-2025-70994?
CVE-2025-70994 is a security vulnerability affecting the Yadea T5 Electric Bicycle's weak authentication system, allowing attackers to forge key fob signals and unlock/start the bicycle without authorization.
Can this vulnerability be exploited remotely?
No, exploitation requires local proximity to intercept legitimate key fob transmissions.
Has Yadea released a patch for this vulnerability?
As of April 2026, Yadea has not responded to CISA's coordination attempts and no official patches have been announced.
How can I protect my Yadea T5 Electric Bicycle from theft?
Use external physical locks, store your key fob in a signal-blocking pouch, avoid leaving the bicycle unattended in unsecured areas, and monitor for firmware updates.
Is this vulnerability being actively exploited?
No known public exploitation has been reported to CISA at this time.
Does this affect other Yadea bicycle models?
The advisory specifically identifies the T5 model; other models have not been confirmed as affected.
What should fleet operators do?
Implement additional physical security measures, educate users on risks, and monitor for suspicious activity closely.
Can insurance cover theft due to this vulnerability?
Depending on your policy, theft may be covered. Check with your insurer for specific coverage details.
How does this vulnerability impact public bike-sharing programs?
Programs using Yadea T5 bicycles may face increased theft risk and should implement layered security controls.
Why this matters
The Yadea T5 Electric Bicycle vulnerability underscores the growing cybersecurity challenges in IoT and transportation devices. As electric bicycles become integral to urban mobility, their security weaknesses translate directly into physical risks, including theft and loss of user trust.
Weak authentication in keyless systems is a common attack vector that can lead to significant financial and operational consequences. The lack of vendor response further complicates mitigation, placing the onus on users and infrastructure operators to implement compensating controls.
Addressing such vulnerabilities proactively is critical to safeguarding emerging transportation technologies and maintaining public confidence in smart mobility solutions.
Sources and corroboration
This article is based primarily on the official advisory published by the Cybersecurity and Infrastructure Security Agency (CISA) on April 23, 2026, available at https://www.cisa.gov/news-events/ics-advisories/icsa-26-113-01. The vulnerability details, impact assessment, and mitigation recommendations are drawn directly from this source, ensuring accuracy and reliability. Additional context on related cybersecurity best practices is referenced from CISA's Industrial Control Systems (ICS) resources.
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Tags: ["Yadea T5 Electric Bicycle", "CVE-2025-70994", "Electric Bicycle Security", "Weak Authentication", "Vehicle Theft", "CISA Advisory", "IoT Vulnerabilities", "Transportation Cybersecurity"]
Source URLs: ["https://www.cisa.gov/news-events/ics-advisories/icsa-26-113-01"]
Sources used for this article
cisa.gov
